Anthony Carter was gunned down in the 4000-block of West Jackson in the West Garfield neighborhood.
Because the street where the shooting happened is a conflict area between rival gangs, police are investigating whether the motive may have been over gang territory.
The family of Anthony Carter says the 18-year-old was a good kid who had dreams of attending college next year.
This shooting comes two days after a 15-year-old CPS student was gunned down in Humboldt Park.
Carter's mother wants to know why someone shot her 18-year-old son several times in the back. Carter was killed on the West Side sidewalk where Tuesday afternoon family and friends gathered to put up balloons and write rest in peace notes.
"I raised him when he was going to high school, and he wanted to finish and go to college, and he's never been in no trouble," said Cornelia Carter, victim's grandmother.
Carter's grandmother says she was in bed Monday night around 11:30 when Anthony told her he was going down the street to get something to eat. She never saw him again
"He went to the restaurant, and he was coming on back, and I don't know what happened when he came back. Somebody came and told me he was shot," Carter said.
The shooting took place right down the street from where Carter lived. Police say the murder may have been gang or drug related.
Carter was going to be a senior at Crane High School. Tommy Langston remembers him well.
"He was a quiet all the time. Every time I saw him in the hallway he was quiet. He stayed out of trouble," said Langston.
Anthony Carter's family is urging the teenager's shooter to turn himself in.
"Come forward and tell the truth, tell what's happened. I want to know what's happened to my grandson," Cornelia Carter said.
Carter's family fears the code of silence may prevent police from finding out who killed Anthony. The Carter's say there were plenty of people on the street when the shooting occurred and somebody saw something.
Carter was the oldest of two brothers and five sisters.